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Using the data storage type defined [[Basic_bitmap_storage|on this page]] for raster images, delegate writing a JPEG file through a '''pipe''' using the <tt>output_ppm</tt> function defined [[Write_ppm_file|on this other page]].
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There are various utilities that can be used for this task, for example: '''cjpeg''' (package ''"jpeg-progs"'' on Linux, or ''"media-libs/libjpeg-turbo"'' on Gentoo), '''ppmtojpeg''' (package ''"netpbm"'' on Linux), '''convert''' (from ''ImageMagick'', multi-platform).
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